Authors: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

The simple reason no embryo can develop without at least one X chromosome is that it's the X, not the Y, that is loaded with important genes. The X carries many of the genes required for muscle development, blood clotting, and color vision. It even carries the gene that enables the body to respond to that most macho of all hormones, testosterone.

Kenneth R. Miller

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